diff --git a/src/Plugin/Field/FieldFormatter/ReadonlyHtmlFieldFormatter.php b/src/Plugin/Field/FieldFormatter/ReadonlyHtmlFieldFormatter.php
index a72ecd0..b8c74bf 100644
--- a/src/Plugin/Field/FieldFormatter/ReadonlyHtmlFieldFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/ReadonlyHtmlFieldFormatter.php
@@ -4,6 +4,8 @@ namespace Drupal\readonly_html_field\Plugin\Field\FieldFormatter;
 
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Field\FormatterBase;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Provides a field formatter of readonly html field.
@@ -16,12 +18,60 @@ use Drupal\Core\Field\FormatterBase;
  */
 class ReadonlyHtmlFieldFormatter extends FormatterBase {
 
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Constructs a new ReadonlyHtmlFieldFormatter object.
+   *
+   * @param string $plugin_id
+   *   The plugin ID for the formatter.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition.
+   * @param array $settings
+   *   The formatter settings.
+   * @param string $label
+   *   The formatter label.
+   * @param string $view_mode
+   *   The view mode the field formatter is being displayed in.
+   * @param array $third_party_settings
+   *   Any third party settings settings.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, $label, $view_mode, array $third_party_settings, LanguageManagerInterface $language_manager) {
+    parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $label, $view_mode, $third_party_settings);
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public static function create(ContainerInterface $container, $plugin_id, $plugin_definition, $field_definition, $settings, $label, $view_mode, array $third_party_settings) {
+    return new static(
+      $plugin_id,
+      $plugin_definition,
+      $field_definition,
+      $settings,
+      $label,
+      $view_mode,
+      $third_party_settings,
+      $container->get('language_manager')
+    );
+  }
+
   /**
    * {@inheritDoc}
    */
   public function viewElements(FieldItemListInterface $items, $langcode) {
-    $langcode = empty($langcode) ? \Drupal::languageManager()->getCurrentLanguage()->getId() : $langcode;
-    $default_langcode = \Drupal::languageManager()->getDefaultLanguage()->getId();
+    $langcode = empty($langcode) ? $this->languageManager->getCurrentLanguage()->getId() : $langcode;
+    $default_langcode = $this->languageManager->getDefaultLanguage()->getId();
     $default_readonly_html = $this->fieldDefinition->getSetting($default_langcode)['readonly_html']['value'];
     $readonly_html = $this->fieldDefinition->getSetting($langcode)['readonly_html']['value'];
     return [
diff --git a/src/Plugin/Field/FieldType/ReadonlyHtmlFieldItem.php b/src/Plugin/Field/FieldType/ReadonlyHtmlFieldItem.php
index 6ecd245..92ef2e8 100644
--- a/src/Plugin/Field/FieldType/ReadonlyHtmlFieldItem.php
+++ b/src/Plugin/Field/FieldType/ReadonlyHtmlFieldItem.php
@@ -40,7 +40,7 @@ class ReadonlyHtmlFieldItem extends FieldItemBase {
         'readonly_html' => [
           'value' => '',
           'format' => 'basic_html',
-        ]
+        ],
       ];
     }
     return $element + parent::defaultFieldSettings();
diff --git a/src/Plugin/Field/FieldWidget/ReadonlyHtmlFieldWidget.php b/src/Plugin/Field/FieldWidget/ReadonlyHtmlFieldWidget.php
index a4903a7..46ad6ea 100644
--- a/src/Plugin/Field/FieldWidget/ReadonlyHtmlFieldWidget.php
+++ b/src/Plugin/Field/FieldWidget/ReadonlyHtmlFieldWidget.php
@@ -5,6 +5,8 @@ namespace Drupal\readonly_html_field\Plugin\Field\FieldWidget;
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Field\WidgetBase;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Provides a widget of readonly html field.
@@ -17,12 +19,60 @@ use Drupal\Core\Form\FormStateInterface;
  */
 class ReadonlyHtmlFieldWidget extends WidgetBase {
 
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Constructs a new ReadonlyHtmlFieldFormatter object.
+   *
+   * @param string $plugin_id
+   *   The plugin ID for the formatter.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
+   *   The field definition.
+   * @param array $settings
+   *   The formatter settings.
+   * @param string $label
+   *   The formatter label.
+   * @param string $view_mode
+   *   The view mode the field formatter is being displayed in.
+   * @param array $third_party_settings
+   *   Any third party settings settings.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, $label, $view_mode, array $third_party_settings, LanguageManagerInterface $language_manager) {
+    parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $label, $view_mode, $third_party_settings);
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public static function create(ContainerInterface $container, $plugin_id, $plugin_definition, $field_definition, $settings, $label, $view_mode, array $third_party_settings) {
+    return new static(
+      $plugin_id,
+      $plugin_definition,
+      $field_definition,
+      $settings,
+      $label,
+      $view_mode,
+      $third_party_settings,
+      $container->get('language_manager')
+    );
+  }
+
   /**
    * {@inheritDoc}
    */
   public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
-    $langcode = \Drupal::languageManager()->getCurrentLanguage()->getId();
-    $default_langcode = \Drupal::languageManager()->getDefaultLanguage()->getId();
+    $langcode = $this->languageManager->getCurrentLanguage()->getId();
+    $default_langcode = $this->languageManager->getDefaultLanguage()->getId();
     $default_readonly_html = $this->fieldDefinition->getSetting($default_langcode)['readonly_html']['value'];
     $readonly_html = $this->fieldDefinition->getSetting($langcode)['readonly_html']['value'];
     $element = [
@@ -35,8 +85,8 @@ class ReadonlyHtmlFieldWidget extends WidgetBase {
    * {@inheritDoc}
    */
   public function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state) {
-    $langcode = \Drupal::languageManager()->getCurrentLanguage()->getId();
-    $default_langcode = \Drupal::languageManager()->getDefaultLanguage()->getId();
+    $langcode = $this->languageManager->getCurrentLanguage()->getId();
+    $default_langcode = $this->languageManager->getDefaultLanguage()->getId();
     $default_readonly_html = $this->fieldDefinition->getSetting($default_langcode)['readonly_html']['value'];
     $readonly_html = $this->fieldDefinition->getSetting($langcode)['readonly_html']['value'];
     $element = [